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How to use the sliding jaw on a Jet parallel clamp

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Forum topic by Rob posted 12-03-2014 06:44 AM 1080 views 0 times favorited 6 replies Add to Favorites Watch
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Rob

704 posts in 2530 days


12-03-2014 06:44 AM

Topic tags/keywords: clamp parallel clamp jet parallel clamp

I’ve noticed in several woodworking videos that people sometimes seem to struggle adjusting their parallel clamps, so maybe this will help.

I just bought my first batch of the Jet parallel clamps last week during the Black Friday sale, and they were delivered today. After opening them up and playing with them, I noticed that the movable jaw was easy to move on some, but very difficult to move on others. For example, on some I could close the jaw without having to pull the quick adjustment trigger, but on others the jaw wouldn’t move unless I pulled the trigger. On at least one of the clamps, the jaw was really stubborn even when I pulled the trigger.

I’m still not quite sure if you’re supposed to have to pull the trigger to close them or not, but after some experimentation with one of the clamps it seems that if you loosen/unscrew the handle all the way (as you do when loosening the clamp), the jaw slides closed more freely; and if you screw the handle in as far as it goes (all of mine stop with about 1/4”-1/2” of the threads still exposed on the handle side of the jaw), the jaw doesn’t move at all, even when you pull the trigger. Has anyone else noticed this, and is this how other brands of parallel clamps also work?

-- Ask an expert or be the expert - http://woodworking.stackexchange.com


6 replies so far

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Patrick

8 posts in 1211 days


#1 posted 12-03-2014 07:13 AM

Yes, I noticed the problem at Woodcrafters and spent some time selecting the ones I wanted.

Later I also discovered losening the clamping through the handles made it easier to adjust, but that was outside production.

This evening I used 4 of them and struggled. M

I like everything else about them, especially the price, but the the sticky slide issue is going to be an issue.

Wouldn’t want these in the shorter versions where I need easy, one hand clamping.

Hope somebody has some answers.

View retfr8flyr's profile

retfr8flyr

327 posts in 1128 days


#2 posted 12-03-2014 08:48 AM

I have several Jet clamps and I have found the if you release all the tension in the handle, unscrew all the way out, then I don’t have any problem sliding the jaws closed. If the handle is screwed in some, the jaws will catch as you try and slide it closed. I don’t know if this works with all the Jet clamps but it works for me.

-- Earl

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paxorion

1100 posts in 1505 days


#3 posted 12-03-2014 04:09 PM

Backing off the screw threads on your clamps before use is always a good idea. In the case of parallel clamps it’s very important since the threads engage the clamp very quickly.

The other thing I’ve found is raising the group like I do with my Bessey or PeachTree clamps help too.

-- paxorion

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Patrick

8 posts in 1211 days


#4 posted 12-03-2014 04:16 PM

I’ll give the “backing out all the way” a try today. I’m sure this is the same issue. Nice to read the solution here rather than suffering until it’s found in the shop.

Paxorion, when you get a chance can you elaborate on, “raising the group like I do with my Bessey or Peachtree clamps”?

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ElChe

630 posts in 795 days


#5 posted 12-03-2014 04:35 PM

The bar looks similar to Bessey. I wax the bar with paste wax. Helps the glide of the slide. And really helps with getting glue drips off the bar. Maybe that will help. On the Bessey clamps the waxing of the bar does not affect the clamping.

-- Tom - Measure twice cut once. Then measure again. Curse. Fudge.

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paxorion

1100 posts in 1505 days


#6 posted 12-03-2014 06:45 PM


I ll give the “backing out all the way” a try today. I m sure this is the same issue. Nice to read the solution here rather than suffering until it s found in the shop.

Paxorion, when you get a chance can you elaborate on, “raising the group like I do with my Bessey or Peachtree clamps”?

- Patrick

My bad, I meant to say raising the (grip) handle. A little movement on the handle can dis-engage the clamp head from the grooves on the bar, allowing for easier movement, and none of the scratching sounds that makes me think clamp wear out and tear.

-- paxorion

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